Well I gave jade pinks and I see nothing of poop anywhere in the tank I haven't checked in her hides and that's basically it and today is feeding day should I feed her if she hasn't pooped ?
I would think if you have no indications (outward signs) that something is wrong you should feed as normal.
If this is a big concern, you could always remove the substrate you are using and replace it with paper towels.
This way you can monitor fecal deposits. (pooping)
Here's one that is mixture of trout, pinky and urates: IMAG0222.jpg
I'm guessing the grey stuff is due to several pieces of trout having the skin still (I thought it would give some extra nutrition, but looks like it doesn't get digested well).
Chris
0.2.0 - T. marcianus (Binky, Esk), 1.1.0 - T. e. cuitzeoensis (Vlad, Lacrimosa), 1.1.0 - T. cyrtopsis (Vimes, Sybil), 0.1.0 - T. s. parietalis (Nobby), 1.1.0 T. radix (Lipwig, Adora Belle)